A packed theater at CES welcomed the hour-long advertisement for Yahoo that CEO Marissa Mayer brought to the stage because, well, it was interesting and entertaining. It was about the most important people: us.

Talk about a bad scene. Michael Bay stormed off the stage in Las Vegas Monday night after a faulty teleprompter couldn’t show his speech. The Hollywood director of Transformers and other blockbusters was about to speak at the Consumer Electronics Show with a Samsung executive to promote the company’s new 150-inch curved television. The episode raises some key questions for communicators.

In the wake of the Niners’ recent playoff victory over the Green Bay packers on the frozen tundra of Lambeau Field, we asked Scott Kegley, senior manager of digital & social media for the San Francisco 49ers, to crack open his team’s social media playbook.

For brands that want to build up their audiences via social media, look no further than “Downton Abbey,” the PBS series about the British aristocracy that returned last night after being on year-long hiatus.